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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2022
Financial Instruments [Abstract]  
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

March 31, 2022

December 31, 2021

(in thousands)

Level 1

Level 2

Level 3

Total

Level 1

Level 2

Level 3

Total

Assets

Cash and cash equivalents:

Cash and money market funds

$

227,251

$

$

$

227,251

$

327,315

$

$

$

327,315

Commercial paper

143,958

143,958

133,185

133,185

U.S. government & agency securities

32,377

32,377

225

225

U.S. Treasury securities

24,988

24,988

Total cash and cash equivalents

227,251

201,323

428,574

327,315

133,410

460,725

Investments:

Commercial paper

141,976

141,976

187,632

187,632

Corporate debt securities

5,313

5,313

8,968

8,968

U.S. government & agency securities

386,912

386,912

387,075

387,075

Total investments

534,201

534,201

583,675

583,675

Short-term restricted cash:

Cash

500

500

500

500

Long-term restricted cash:

Cash

4,982

4,982

4,592

4,592

Total assets measured at fair value

$

232,733

$

735,524

$

$

968,257

$

332,407

$

717,085

$

$

1,049,492

Liabilities

Contingent consideration

$

$

$

168,654

$

168,654

$

$

$

169,717

$

169,717

Total liabilities measured at fair value

$

$

$

168,654

$

168,654

$

$

$

169,717

$

169,717

Changes in the estimated fair value of contingent consideration liabilities [Table Text Block]

(in thousands)

Level 3

Beginning balance as of December 31, 2021

$

169,717

Change in estimated fair value

(1,063)

Ending balance as of March 31, 2022

$

168,654

Summary of Cash, Cash Equivalents and Investments

As of March 31, 2022

Gross

Gross

Amortized

unrealized

unrealized

Fair

(in thousands)

Cost

gains

losses

Value

Cash and cash equivalents:

Cash and money market funds

$

227,251

$

$

$

227,251

Commercial paper

143,964

2

(8)

143,958

U.S. government & agency securities

32,386

(9)

32,377

U.S. Treasury securities

24,989

(1)

24,988

Total cash and cash equivalents

428,590

2

(18)

428,574

Investments:

Commercial paper

142,266

1

(291)

141,976

Corporate debt securities

5,322

(9)

5,313

U.S. government & agency securities

390,682

7

(3,777)

386,912

Total investments

538,270

8

(4,077)

534,201

Total cash, cash equivalents and investments

$

966,860

$

10

$

(4,095)

$

962,775

Short-term restricted cash:

Cash

$

500

$

$

$

500

Long-term restricted cash:

Cash

$

4,982

$

$

$

4,982

As of December 31, 2021

Gross

Gross

Amortized

unrealized

unrealized

Fair

(in thousands)

Cost

gains

losses

Value

Cash and cash equivalents:

Cash and money market funds

$

327,316

$

$

$

327,316

Commercial paper

133,190

(5)

133,185

U.S. government & agency securities

225

224

Total cash and cash equivalents

460,731

(5)

460,725

Investments:

Commercial paper

187,705

(73)

187,632

Corporate debt securities

8,964

9

(5)

8,968

U.S. government & agency securities

388,088

1

(1,014)

387,075

Total investments

584,757

10

(1,092)

583,675

Total cash, cash equivalents and investments

$

1,045,488

$

10

$

(1,097)

$

1,044,400

Short-term restricted cash:

Cash

$

500

$

$

$

500

Long-term restricted cash:

Cash

$

4,592

$

$

$

4,592

Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments

(in thousands)

Fair Value

Due in one year or less

$

651,213

Due after one year through five years

84,311

Total investments

$

735,524